Green leaf crop.
Spinach grows best in cooler weather and quickly runs to seed in warm weather.
Can be sown in Fall/Autumn and overwintered if protected by mulch.
Not recommended to grow in warm areas.
Alternatives suitable for warm areas are Swiss Chard (Silverbeet) or NZ spinach.

My understanding is that the warmer weather can cause it to bolt and go to seed extremely quickly. It likes sun but needs less heat to give the full benefits and yeild. Nz spinach does better during the summer months and is a good alternative option.

I've had great success with English Medania Spinach from D.T. Brown seeds (in sub-tropical area). I planted about 6 weeks ago and they are ready for picking. Packet recommends planting August and Winter for my area.

What type of insects are you wanting to keep out? Remember, not all insects are harmful to your veggie patch. Mint, dill, and sage are all good at repelling the cabbage moth from your brassicas. Basil, chamomile, and lavender repel flies and mosquitoes. There are many other examples.

I grew up in NZ and we grew and ate what we called spinach (english) or silver beet. I can easily buy the same silverbeet but never see english spinach, only 'baby'spinach. Not what I want on a winter's night. I thought it may be bought up by supermarkets from 'down south'.
Also what did you mean by NZ Spinach? Thanks.

New Zealand spinach, which also grows wild in south eastern Australia is a soft leafed groundcover with the name of Tetragonia tetragonioides. It is also called Warrigal Greens. It grows easily from cuttings and can be eaten raw or steamed. Normally only the tips and fresh growth are eaten.
(http://www.gardenate.com/plant/NZ%20Spinach?zone=2)

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